Help System (web edition)

LINES=<list_of_line_specifications> 
(in the PLOT /FRAME operation)
gives a list of extra sequences of line segments to be drawn in the
current graph. Each member of this list is a word (name of the
sequence) and any such a sequence must be given in the form

   <name_of_the_sequence>=xhome,yhome,x1,y1,x2,y2,...,xn,yn

Then a polyline starting from point (xhome,yhome) and going through
points
        (xhome+x1,xhome+y1)
        (xhome+x1+x2,yhome+y1,y2)
        ...
        (xhome+x1+x2+...+xn,yhome+y1+y2+...+yn)
will be drawn.
All the values are in plotting units (not in user coordinates).

   P = More information on plotting